serial: 8250_early: confirm empty transmitter after sending characters

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The current code waits until the transmitter becomes empty,
before sending each character, and after finishing the whole string.
This seems a bit redundant.

It can be more efficient by checking the transmitter only after sending
each character.  This should be safe because the transmitter is already
empty at the first entry of serial_putc().

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Masahiro Yamada 2015-10-30 11:39:04 +09:00 • committed by Greg Kroah-Hartman

parent 2cda227bba

commit f2bfdb0628

1 changed files with 1 additions and 4 deletions

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drivers/tty/serial/8250/8250_early.c

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